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#1
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Why did MB design the 616/617 with a non-crossflow head?
I've been wondering about this. By the mid-60's almost all the cars I can remember, even crappy ones, had crossflow heads. Why didn't Mercedes make the 61X engines crossflow?
With a diesel does non-crossflow have some advantage? The only reason I can come up with is it makes maintenance easier since they put the injectors and GP's on the opposite side to the manifolds. Maybe since they were targeting the taxi market ease of maintenance won out over performance. What do you guys and girls think?
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'81 300CD - 180K, cannot be killed by any conventional means '99 Ford Escort - good MPG |
#2
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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money." |
#3
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Quote:
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#4
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The OM61x series was basically a modified version of the engines thay had been using for decades. It wasn't until the 1984 OM601 that MB made a complete redesign of the engine.
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#5
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Quote:
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#6
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The VW 2.0L PD engine was crossflow several years ago.
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#7
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Quote:
Yep, they're just the smaller slightly evolved offspring of the U-boat diesels.... U-300SD
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#8
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A non cross flow head was a big improvement over the side valve it replaced.
State of the art when it was designed. Truthfully in diesel It probably does not make much difference since the valves are straight up and down. Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#9
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Quote:
especially on a FI engine
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1981 300SD 512k OM603 |
#10
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Probably because non-cross flow is so much easier to turbo so they didn't bother to change..
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Ron Schroeder '85 300 Turbo Diesel 2 tank WVO '83 300 Turbo Diesel 2 tank WVO Some former WVO vehicles since ~1980: '83 Mercedes 240D '80 Audi 4000D '83 ISUZU Pup '70 SAAB 99 with Kubota diesel '76 Honda Civic with Kubota diesel '86 Golf Several diesel generators All with 2 tank WVO conversion LI NY |
#11
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Quote:
The "roots" of the OM61X series of engines trace directly back to the OM621 that was first installed in the 1959 190D.
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98 Dodge-Cummins pickup (123k) 13 GLK250 (135k) 06 E320CDI (323K) 16 C300 (62K) 82 300GD Gelaendewagen (54K) |
#12
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And what did the OM621 descend from?
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#13
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A reverse flow head at the time gave better performance and fuel economy than a crossflow head because it was a diesel. A crossflow head developes it's advantages at a high RPM, 5500 RPM and above, something you don't do to a Diesel any way!
A reverse flow head also made it easier to Turbocharge and it was much better for fuel economy and emissions.
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Save and enlarge for explanation of financial crisis! http://www.mobile-phone-solutions.com Advice on cell phone signal antennas and amplifiers. |
#14
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The OM621 was a "clean sheet of paper" design - it was state of the art thinking... in 1957.
I'm not sure why you used the smiley icon? but the engine that preceeded the OM621 was the OM636, used in the 180D.
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98 Dodge-Cummins pickup (123k) 13 GLK250 (135k) 06 E320CDI (323K) 16 C300 (62K) 82 300GD Gelaendewagen (54K) |
#15
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Cheers, Robert |
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